Friction device.



L. .WHITCOMB.

FRIGTION DEVICE.

APPLIOATION FILED JULY 1o, 1907.

917532@u Patented Apr. 6, 1909,

lUNlTE s'i-Afrns rn'rs s onirica.

LAWRENCE WHITCOMB, OF BROKLINE, MASSACHUSETTS, ASSIGNOR TO NATIONAL B AND CLUTCH COMPANY, OF BOSTON,"MASSACHUSETTS, A CORPORATION.

FRICTION DEVICE. A

Specication of Letters Patent.

Patented April 6, 1909.

Application ined July 1o, 1907. serial No. 383,045.

To all 'whom it may concern:

Be it lmown that l, LAWRENCE WnrrcoMB, a citizen or' the United States, residing in Brookline, in the county of Norfolk and State of Massachusetts, have invented an Improvement in Friction Devices, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts. Y

This invention relates to a device having a plurality of holes or openings in Which are inserted blocks, sections or pieces of cork, to form a friction surface of increased efficiency. The present invention has for its object to provide the device with means for holding the cork inserts and for retaining them in their openings.

The invention is especially designed and adapted for use in pulleys, Wheels, bands, straps or other metal bodies, which are substantially thin and do not possess the re quired thickness for holding and retaining the inserts. I

ln accordance with this invention, the pulley, band or other device is provided on its inner side with prongs or projections eX- tended from the opening in said device and adapted to engage the cork insert and hold the same in its opening. The holding prongs or projectionsy may be made integral with the device and formed when the hole or opening therein is made, and said prongs or projections may also serve as holding means for a socket piece into which the Vcork insert is extended.

These and other features ot this invention will be pointed out in the claims at the end of this specification.

Fi ure 1 is a side elevation of a pulley or whee embodyin `this invention, and Figs. 2 and 3, sectional etails to be referred to.

ln the present instance l .have shown the invention as embodied in a pulley or wheel (L, but l do not desire to limit my invention in this respect, as it is e ually applicable to any device of substantie ly thin metal, the irictional efliciency of which it is desired to increase, such for instance as brake bands,

straps, etc.

The metal rim b of the pulley, is provided with a plurality of holes or openings c (see TFig. 3), into which are inserted, blocks, sec- 3. The prongs or projections e may also serve to hold a socket piece or cup f into which the cork insert is extended and by which it is protected, which may be `accomplished by expanding" the lower ends of the prongs to a larger diameter than the hole or opening c in the rim l) and into engagement with converging or ta ering side walls g of the socket piece as c early shown in Fig. 2, wherein it will be seen that the outer or lower end oi the socket piece is of greater width or diameter than the inner or upper portion of the same, which allows the lower portion of the cork insert d to expand to a greater diameter than the opening in the rim, thus offering a resistance to the cork insert working out through the opening c and4 serving to help Yretain said cork insert in the opening in the rim or band. The socket pieces f also serve to prevent the cork from being forced through the o ening from the outer side of the rim. Se a o the prongs e are separatedfrom one another at their free ends, thereby forming spaces z into Which the cork may be forced in its expansive movement and thus form a locking engagement with the said prongs, Which serves to retain the cork insert in its opening.

Claims. A

1. ln combination, al substantially thin metal body having a plurality, oi holes or openings, and a plurality of prongs or projec tlons surrounding said openings and integral with said body, socket pieces secured to said body by said prongsor projections, and cork sections inserted through said openings into said socket pieces, substantially as described.

2. ln combination, a substantially thin metal body having a plurality oi holes or openings, and a plurality of prongs orpi-ejections surrounding said openings and integral L metal body yportion having a plurality oiy holes or openings, cork sections inserted throilgh said o enngs, andi tions attache -to said bo rongs or projecy and extended tions -may expand su stantially as described.

In testimony whereof, I have signed my name to this specification in the two subscribing witnesses.

`VVitnessses:

JA's. H. CHURCHILL, J. MURPHY.

presence of LAWRENCE 

